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Game Courier Ratings. Calculates ratings for players from Game Courier logs. Experimental.[All Comments] [Add Comment or Rating]
🕸📝Fergus Duniho wrote on Tue, Jan 10, 2006 03:51 AM UTC:

Roberto writes:

One point of serious discussion is whether a rated player must lose rating when defeated by a less rated player, and if the response is accepted to be YES, how much must be the loss?

I'm not sure this question makes sense within the context of how GCR works. When GCR compares two opponents, it uses the total of their scores in a single comparison, and it does not compare them on a game-by-game basis. But let's suppose two players play only one game together, and the higher rated player loses to the lower rated player. In that case, the higher rated player will lose points. The loss of points is determined by the difference between their ratings, by the stability of the higher rated player's rating, and by the reliability of the score, which for only one game is its lowest at 25.